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They don't seem to be able to fit through 1" wire, only the 2". Once they get into a specific coop because I use 1" between the areas to prevent the roos from grabbing each other, the birds are stuck in that specific coop.
Of course, me never wanting to take a chance, bought the 5/ 16" openings because the birds MIGHT be able to squeeze through 1" wire if they weren't panicked and trying to get through in a hurry. They slam into my windows, vents, walls when I come into the coop, trying to escape. I did notice though that the coops with the canvas over the pop holes--no sparrows most of the time. It seems that they avoid those doors. So I guess I can hang another four of those...I just don't like that it's cutting down on my ventilation a little bit doing that--although I usually end up blocking the doors with cardboard for a few weeks out of the year (when the wind is howling & ripping through the coop!)
These are "house sparrows," not even a native U.S. species....